/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.refactoring;

import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.core.runtime.jobs.IJobManager;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jdt.ui.refactoring.RefactoringSaveHelper;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.PerformChangeOperation;
import org.eclipse.ltk.core.refactoring.Refactoring;
import org.eclipse.ltk.core.refactoring.RefactoringCore;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;

import java.lang.reflect.InvocationTargetException;


/**
 * A helper class to execute a refactoring. The class takes care of pushing the
 * undo change onto the undo stack and folding editor edits into one editor
 * undo object.
 */
public class RefactoringExecutionHelper {

	private final Refactoring      fRefactoring;
	private final int              fStopSeverity;
	private final int              fSaveMode;

	private PerformChangeOperation fPerformChangeOperation;

	private class Operation implements IWorkspaceRunnable {
		public        Change                 fChange;
		public        PerformChangeOperation fPerformChangeOperation;
        public        RefactoringStatus allConditions;
		private final boolean                fForked;
		private final boolean                fForkChangeExecution;

		public Operation(boolean forked, boolean forkChangeExecution) {
			fForked = forked;
			fForkChangeExecution = forkChangeExecution;
		}

		public void run(IProgressMonitor pm) throws CoreException {
			try {
				pm.beginTask("", fForked && !fForkChangeExecution ? 7 : 11); //$NON-NLS-1$
				pm.subTask(""); //$NON-NLS-1$

				final RefactoringStatus status =
						fRefactoring.checkAllConditions(new SubProgressMonitor(pm, 4, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
				if (status.getSeverity() >= fStopSeverity) {
//					final boolean[] canceled = {false};
//					if (fForked) {
//						fParent.getDisplay().syncExec(new Runnable() {
//							public void run() {
//								canceled[0] = showStatusDialog(status);
//							}
//						});
//					} else {
//						canceled[0] = showStatusDialog(status);
//					}
//					if (canceled[0]) {
                    allConditions = status;
						throw new OperationCanceledException();
//					}
				}

				fChange = fRefactoring.createChange(new SubProgressMonitor(pm, 2, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
				fChange.initializeValidationData(new SubProgressMonitor(pm, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));

				fPerformChangeOperation = new PerformChangeOperation(fChange);//RefactoringUI.createUIAwareChangeOperation(fChange);
				fPerformChangeOperation.setUndoManager(RefactoringCore.getUndoManager(), fRefactoring.getName());
				if (fRefactoring instanceof IScheduledRefactoring)
					fPerformChangeOperation.setSchedulingRule(((IScheduledRefactoring)fRefactoring).getSchedulingRule());

				if (!fForked || fForkChangeExecution)
					fPerformChangeOperation.run(new SubProgressMonitor(pm, 4, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
			} finally {
				pm.done();
			}
		}

//		/**
//		 * @param status the status to show
//		 * @return <code>true</code> iff the operation should be cancelled
//		 */
//		private boolean showStatusDialog(RefactoringStatus status) {
//			Dialog dialog = RefactoringUI.createRefactoringStatusDialog(status, fParent, fRefactoring.getName(), false);
//			return dialog.open() == IDialogConstants.CANCEL_ID;
//		}
	}

	/**
	 * Creates a new refactoring execution helper.
	 *
	 * @param refactoring the refactoring
	 * @param stopSeverity a refactoring status constant from {@link RefactoringStatus}
	 * @param saveMode a save mode from {@link RefactoringSaveHelper}
	 */
	public RefactoringExecutionHelper(Refactoring refactoring, int stopSeverity, int saveMode) {
		super();
		Assert.isNotNull(refactoring);
//		Assert.isNotNull(parent);
//		Assert.isNotNull(context);
		fRefactoring= refactoring;
		fStopSeverity= stopSeverity;
//		fParent= parent;
//		fExecContext= context;
		fSaveMode= saveMode;
	}

	/**
	 * Must be called in the UI thread.
	 * @param fork if set, the operation will be forked
	 * @param cancelable  if set, the operation will be cancelable
	 * @throws InterruptedException thrown when the operation is cancelled
	 * @throws InvocationTargetException thrown when the operation failed to execute
	 */
	public RefactoringStatus perform(boolean fork, boolean cancelable) throws InterruptedException, InvocationTargetException, CoreException {
		return perform(fork, false, cancelable);
	}

	/**
	 * Must be called in the UI thread.<br>
	 * <strong>Use {@link #perform(boolean, boolean)} unless you know exactly what you are doing!</strong>
	 *
	 * @param fork if set, the operation will be forked
	 * @param forkChangeExecution if the change should not be executed in the UI thread: This may not work in any case
	 * @param cancelable  if set, the operation will be cancelable
	 * @throws InterruptedException thrown when the operation is cancelled
	 * @throws InvocationTargetException thrown when the operation failed to execute
	 */
	public RefactoringStatus perform(boolean fork, boolean forkChangeExecution, boolean cancelable)
            throws InterruptedException, InvocationTargetException, CoreException {
//		Assert.isTrue(Display.getCurrent() != null);
		final IJobManager manager=  Job.getJobManager();
		final ISchedulingRule rule;
		if (fRefactoring instanceof IScheduledRefactoring) {
			rule= ((IScheduledRefactoring)fRefactoring).getSchedulingRule();
		} else {
			rule= ResourcesPlugin.getWorkspace().getRoot();
		}
        Operation op = null;
		try {
//			try {
//				Runnable r= new Runnable() {
//					public void run() {
//						manager.beginRule(rule, null);
//					}
//				};
////				BusyIndicator.showWhile(fParent.getDisplay(), r);
//			} catch (OperationCanceledException e) {
//				throw new InterruptedException(e.getMessage());
//			}

//			RefactoringSaveHelper saveHelper= new RefactoringSaveHelper(fSaveMode);
//			if (!saveHelper.saveEditors(fParent))
//				throw new InterruptedException();

			try{
				op = new Operation(fork, forkChangeExecution);
				op.run(new NullProgressMonitor());
				fPerformChangeOperation = op.fPerformChangeOperation;
//			fRefactoring.setValidationContext(fParent);
				if(op.fPerformChangeOperation != null) {
                    ResourcesPlugin.getWorkspace().run(op.fPerformChangeOperation, new NullProgressMonitor());
                }
//				if (fork && !forkChangeExecution && op.fPerformChangeOperation != null)
//					fExecContext.run(false, false, new WorkbenchRunnableAdapter(op.fPerformChangeOperation, rule, true));

				if (op.fPerformChangeOperation != null) {
					RefactoringStatus validationStatus= op.fPerformChangeOperation.getValidationStatus();
					if (validationStatus != null /*&& validationStatus.hasFatalError()*/) {
//						MessageDialog.openError(fParent, fRefactoring.getName(),
//								Messages.format(
//										RefactoringMessages.RefactoringExecutionHelper_cannot_execute,
//										validationStatus.getMessageMatchingSeverity(RefactoringStatus.FATAL)));
//						throw new InterruptedException();
						return validationStatus;
					}
				}
			} catch (OperationCanceledException e) {
				if(op != null) {
					if (op.allConditions != null) {
						return op.allConditions;
					}
				}
				throw new InterruptedException(e.getMessage());
			} finally {
//				saveHelper.triggerIncrementalBuild();
			}
		} finally {
//			manager.endRule(rule);
			fRefactoring.setValidationContext(null);
		}
        return new RefactoringStatus();
	}

	public PerformChangeOperation getfPerformChangeOperation() {
		return fPerformChangeOperation;
	}
}
